Where do fleas in the house come from?
A female flea needs a blood meal from an animal before she starts laying eggs, so it usually begins with a cat or a dog. It doesn’t have to be your pet, though. Street cats that sleep in the air shaft, under the stairs or in the garden leave eggs and cocoons in those spots, and an adult flea can hitch a ride on your shoe or the leg of your pants and come into the apartment with you.
If no animals live in your home at all, look for one that visits. It could be a cat giving birth in the storage loft or on the roof of the building, or cats feeding from the trash next to your front door. Treating the home while that source is still open means the fleas will come back the same way.
The flea life cycle: why do fleas come back after treatment?
A flea goes through 4 stages, and each stage lives in a different part of your home:
- Eggs are laid in the pet’s fur and drop onto the floor and furnishings. They hatch in about 2 to 5 days.
- Larvae live between carpet fibers and under furniture for 8 to 15 days, feeding on the droppings of adult fleas.
- Cocoons are where the flea finishes developing. It stays inside for 1 to 4 weeks, and longer if the home is empty or the weather is cold.
- Adult fleas look for an animal or a person to feed on as soon as they come out, and once they find an animal, they stay on it.
The whole cycle can take about 18 days at normal indoor temperatures, or stretch to 75 days depending on heat and humidity. So the fleas jumping in front of you today are the last link in the chain. Under them, in the carpet, a whole generation hasn’t come out yet.
What confuses people is that insecticide doesn’t reach the cocoon. A few days after the treatment you see new fleas and think it failed. In fact, they are fleas coming out of their cocoons onto a treated floor, and they keep coming out like this for about two weeks. Vacuuming every day makes them come out faster, so that period gets shorter.
Fleas in an empty apartment: why do they bite as soon as you move in?
This story comes up again and again. People move into a new apartment, or come back from a summer holiday, and within a day or two their legs are full of bites. The cause is fleas waiting in their cocoons. When an apartment stays closed with no animals and no people, the fully formed flea stays inside its cocoon, sometimes for months. As soon as someone walks across the floor, the vibration, the warmth and human breath wake it up, and it comes out hungry and jumps onto the nearest leg.
The same thing happens when the cat leaves the house. The fleas that come out of cocoons after that have nobody to bite except the people living there, so bites can increase after the pet is gone instead of dropping.
If you rent out an apartment, it’s much easier to treat it after a tenant with a pet moves out, and before the new tenant moves in, than to deal with a complaint a week later. A good vacuum of the carpets before the treatment removes some of the eggs and brings fleas out of their cocoons while the product can still reach them.
When should you call a flea control company?
If the vet has treated your pet, you’ve been vacuuming daily or every other day, and two weeks later the bites haven’t stopped, some spots in the home haven’t been treated. The same goes for fleas in more than one room, in large carpets and fabric sofas that are hard to wash, or bites from day one in a new apartment. If you still see adult fleas 4 weeks after treatment, the place needs another look.
Send us a photo of the bites or of a flea on WhatsApp at +201007892200, and tell us the number of rooms, the type of flooring and where your pet sleeps. We can be with you the same day in any of Egypt’s 27 governorates, and before the treatment the technician tells you when to take the pets out and when you can all come back. Other ways to reach us are on the contact page.